Does obsidian exist in a completely clear form?

Question

Obsidian that I have found has always been black or black/red. I found an unusual piece that I believe could be clear obsidian-this is my best guess. I just never heard of completely clear obsidian.

Answer 1

No, obsidian is a natural glass, an amorphous mixture of different minerals. It is too impure and to be very clear. Quartz crystals are often clear. but they are crystalline, not amorphous (or cryptocrystalline-- look those words up). I suppose you might luck out and find a piece that didn't have enough of the wrong kind of impurities to make it opaque, but for obsidian that has to be a rarity. Mineral identification references specify that obsidian is usually black.

Where did you find it, btw...?

Answer 2

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RE:
Does obsidian exist in a completely clear form?
Obsidian that I have found has always been black or black/red. I found an unusual piece that I believe could be clear obsidian-this is my best guess. I just never heard of completely clear obsidian.

Answer 3

See an excerpt from the article given at the website below:

Origin and properties
While a rock like basalt is dark because of ferromagnesian enrichment, despite its dark color, obsidian consists mainly of SiO2 (silicon dioxide), 70% or more. Obsidian is mineral-like, but not a true mineral because it is not crystalline. Its composition is very similar to that of granite and rhyolite. It is sometimes classified as a mineraloid. Because obsidian is metastable at the earth's surface (over time the glass becomes fine-grained mineral crystals), no obsidian has been found that is older than Cretaceous age. The breakdown of obsidian is accelerated by the presence of water. Tektites were once thought by many to be obsidian produced by lunar volcanic eruptions, though few scientists now adhere to this hypothesis.

While pure obsidian is always dark in appearance, the color varies depending on the presence of impurities. Iron and magnesium typically give the obsidian a dark green to brown to black color. In some stones, the inclusion of small, white, radially clustered crystals of cristobalite in the black glass produce a blotchy or snowflake pattern (snowflake obsidian). It may contain patterns of gas bubbles remaining from the lava flow, aligned along layers created as the molten rock was flowing before being cooled. These bubbles can produce interesting effects such as a golden (sheen obsidian) or rainbow sheen (rainbow obsidian). Obsidian is relatively soft with a typical hardness of 5 to 5.5. Its relative density is approximately 2.6.

Answer 4

No. As you said there are consequences to the passage of time. The past can only exist in the present due to aging. This is why historians are important. An unbiased recording of events is the only means to capture the events. Photographs, structural ruins interspersed with ancient legends, musueum pieces are a means to understand the past. But all objects exist in the eternal present and where the past and future come and go. Be well.

Answer 5

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Entropy shows that the past no longer exists, and cannot be reconstructed. A broken egg stays broken, and cannot become an egg again.

Answer 6

i dont think there is such a thing